Pump shock absorber



Oct. 3, 1944. w AUL BERRY 2,359,389

PUMP SHOCK ABSORBER Filed Dec. 14, 1942 Jayfl Saalsfierry I N VEN TOR.

w ATTD RNEYS Fatented Oct. 3, 1944 UNITED STATES PATENT OFFICE PUMP SHOCK ABSORBER Jay L. Saulsberry, Burbank, Calif.

Application December 14, 1942, Serial No. 468,977

2 Claims.

My invention relates to pumps, and has among its objects and advantages the provision of an improved compression chamber functioning as a shock absorber on the upward stroke of the pump.

In the accompanying drawing:

Figure 1 is a sectional view of a shock absorber in accordance with my invention; and

Figure 2 is a sectional view taken along the line 2-2 of Figure l.

A portion of a conventional pump plunger is illustrated at I3, which plunger is connected with the usual-pump rod l2. The plunger l operates in a tube [4 connected with the lower end of a tube l6 by a coupling member l8. This coupling member is internally threaded at its lower end, as at 20, for connection with the tube 14, and its upper end is externally threaded, as at 22, for threaded connection with the internally threaded lower end of the tube I6. Inside the tube I3 is concentrically arranged a tube 24 having its upper end threadedly connected at 26 with the tube 28 functioning as a conduit for the liquid pump from the well.

A washer-like end wall 30 is welded to the tubes l6 and 24 to close the space 32 between the two tubes at the upper end of the tube l6. A series of ribs 34 connects the lower end of the tube 24 with the tube IS a short distance above the coupling member i8. The ribs 34 are spaced to provide openings 36 which place the chamber 38 between the ribs and the coupling member I8 in communication with the space 32 above the ribs. Perf-orations 40 are provided in the tube 24 adjacent the ribs 34. The ribs 34 and the washer-like plate 30 fixedly connect the tubes l6 and 24 as a unit, and the wall member 30 provides an airtight connection between the two tubes.

The liquid pump from a well, particularly in deep wells, imposes a heavy load or resistance to the upper stroke of the pump. The load effective on the pump must be moved instantly upon the start of the upward stroke of the pump. Such resistance results in an enormous strain upon the pump rod and the operating means associated therewith. In the instant case, the space 32 functions as a compression chamber which functions as a shock absorber to reduce the strain on the pump. The ribs 34 are spaced so that the liquid is free to flow into the space 32, and liquid may also enter the space through the perforations 41!. Liquid forced into the space 32 traps the air therein, so that the air is compressed in accordance with the force imposed thereon. Thus the trapped air functions as a cushion for each stroke of the pump, thereby eliminating a dead and sudden load on the upward stroke of the pump. This is particularly important in windmill operated pumps.

The tubes l6 and 24 are firmly connected as a unit which may be interposed in the pump tubing. The ribs 34 are so ararnged as to provide unobstructed entry of liquid into the space 32, and the ribs perform an additional function as a connecting means between the lower ends of the two tubes. Because of the spaces 33 and the perforations 40, ample communication is provided between the chambers 32 and 38 Without further elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current knowledge, readily adapt the same for use under various conditions of service.

I claim:

1. In a pump, a plunger casing, an outer tube connected with the plunger casing, an inner tube disposed concentrically within and spaced from said outer tube, said inner tube terminating short of the bottom end of the outer tube, an annular wall providing a seal between the inner and outer tubes substantially above the bottom end of the inner tube, and a plurality of circumferentially spaced ribs fixedly connecting the bottom end of the inner tube with the outer tube, said inner tube being provided with an annular series of apertures above and adjacent to its bottom end.

2. In a pump, a plunger casing, an outer tube connected with the plunger casing, an inner tube disposed concentrically within and spaced from said outer tube, said inner tube terminating short of the bottom end of the outer tube, an annular wall providing a seal between the inner and outer tubes substantially above the bottom end of the inner tube, and a plurality of circumferentially spaced inclined elements connecting the inner tube with the outer tube, said elements having their upper inner ends secured to the bottom of the inner tube and their outer ends secured to the outer tube in frusto-conical arrangement.

JAY L. SAULSBERRY. 

